Lifting and pulling hook



(No Model.)

A. A. PORTER.

. LIPTING AND PULLING HOOK.

No. 370,350. Patented Sept. 20, 1887.

UNITED STATES PATENT OFFICE.

ABRAHAM A. PORTER, OF COLUMBIA, ASSIGNOR OF ONE-HALF TO G ELON W. WEST, OF ROCKVILLE, CONNECTICUT.

LIFTING AND PULLING HOOK.

SPECIFICATION forming part of Letters Patent No. 370,350. atea September 20, 1887.

' AApplication filed November 23, 1866. Serial No. 219.717.` (No model.)

To all whom, t may concern,.-

Beit known that I, ABRAHAM A. PORTER, of Columbia, in the county of Tolland and State of Connecticut, have invented a certain new and useful Improvement in Lifting and Pulling Hooks, of which the following is a description, reference being had to the accompauying drawings, wherein- Figure l is a side View showing my improvement applied to the lifting of a log. Fig. 2 is a back view of one of the hooks.

My improvement relates to the class of hooks that are more especially adapted for lifting and drawing logs; and the object of my improvement is to construct ahook to be used singly or in pairs for drawing heavy articles, which will bite the article pulled in direct proportion toits weight-that is, ythe heavier the article pulled the harder the hooks will grasp it-and thus avoid all danger of accidents which are caused by the letting go of the hooks now in use.

My improvement consists in a hook or clamp adapted to engage the article to be moved, having a lever pivoted to one end in such manner that one end of the lever presses on the back of the hook in a direction to force the hook into the article when the drawing force is applied to the other end of the lever, and in details of the construction and proportion of the parts, as more particularly hereinafter described, and pointed out in the claims.

In the accompanying drawings, the letter a denotes a log; b b, two hooks having their points set into the log; c c, levers pivoted to the fore end of the hooks,with their rear ends bearing on the back of the hooks, and with draft-chains d d attached to their fore ends. These draft-chains are attached at their fore ends to aswivel, e, 85e. When force is applied to the draft-chains d d in the direction indicated by the arrow, one effect thereof is to cause the rear ends of the levers c to bear on the backs of the hooks b with a force directly proportioned to the draft force, with the resultant effect of forcing the points of the hooks toward each other, and the stronger the draft force the more strongly the points of the hooks are forced toward each other, and of course the more tightly they tend to bite into 5o the log. I may state as a practical detail of this improvement'that I prefer that the dis tance from the fore end of a -lever c to its pivot upon the hook shall be one-tl1ird of the length of the lever, as this location of the fulcrum of the lever c gives the best leverage for forcing in the points of the hooks.

I have shown this improvement in the accompanying drawings as applied to the hauling of a log. It will be readily understood 6c.

that with obvious changes the improvement may be adapted to lifting stones, barrels, &c.

I claim as my improvement- 1. The combination of the hook b and the lever c, pivoted to the hook at substantially one-third of its length, and having one end adapted to bear upon the hook directly back of the point, and the other end providedwith a loop, all substantially as described, and for the purpose specified.

7o 2. The combination of the hook b and the lever c, pivoted to the hook, with one end adapted to bear upon the back of the hook at substantially the center of its length, and the other end provided with a hole for the attachment of the draft-chain, t-he pivot or fulcrum of the lever c being substantially one-third of the distance from the power end to the load end of the lever, all substantially as described, and for the purpose set forth.

ABRAHAM A. PORTER. Witnesses:

FRED H. HOLT, EUsTAoE C. CHAPMAN. 

